Fig 184. [Biennial Wormwood. Artemisia biennis] Willd.
![[Biennial Wormwood. Artemisia biennis]](#1525880611323293367_fig-184.jpg.id-6578089134638723614.wrap-0.html.html){kind=link}
Biennial Wormwood. Artemisia biennis Willd. Achenes dark brown, smooth, somewhat flattened, 3–4 angled, obovate, narrowed at the base .8–1.3 mm. long. Native in the northwestern United States and introduced east with grass seeds. Moist land.
Fig 185. [Smaller Bur-Marigold. Bidens cernua] L.
![[Smaller Bur-Marigold. Bidens cernua]](#1525880611323293367_fig-185.jpg.id-9182317469569982494.wrap-0.html.html){kind=link}
Smaller Bur-Marigold. Bidens cernua L. Flowers yellow; achenes 4–6 mm. long, dull brown, the awns lighter, flattened, 4-angled, wedge-shaped, awns 2–4, barbed downward as also are the ribs. Native of this country. Low lands.
